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Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2018	Apr. 30, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
Realized and Unrealized Gains (Losses) on Financial Instruments
Realized and unrealized gains (losses) on financial instruments, net			$ (2,019)	$ (2,019)
Series C common stock | Zero-strike call option
Realized and Unrealized Gains (Losses) on Financial Instruments
Realized and unrealized gains (losses) on financial instruments, net			$ (2,019)	$ (2,019)
Derivative underlying share amount	632,911	610,325	632,911	632,911	0
Derivative premium paid		$ 47,800
Derivative settlement proceeds	$ 46,500

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